8ob
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- Nescient in the vale
I have had the pleasure of grovelling around in hell hole pits, biggest enemy is height as one height never suits all. Better to go deep and use a hopup than be crouched with a bent neck .Water is another problem, lost count of the hours spent hopping from one milk crate to another all for the sake of fitting a sump pump. Gas although I have never come across the problem would probably need a Bif fan where the motors are sealed from the air stream https://www.envirotec.co.uk/product/bifurcated-fans-bif/
Bob
Bob